Chapter 11: Miscellaneous Types
of fasteners
•Key is a piece of steel lying partly in a
groove in the shaft and extending into
another groove in the hub.
•Keyseat is the groove in the shaft
•Keyway is the groove in the hub or
surrounding part
MISCELLANEOUS FASTENERS
TYPES OF KEYS
MISCELLANEOUS FASTENERS
TYPES OF KEYS
Dimensioning of Keyseats
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•
•
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Width
Depth
Location
Length (if required)
MISCELLANEOUS FASTENERS
DIMENSIONING KEYSEATS
Splines & Serrations
• A splined shaft is a shaft having multiple
grooves cut around its circumference for a
portion of its length in order that a sliding
engagement may be made with corresponding
internal grooves of a mating part
MISCELLANEOUS FASTENERS
SPLINES
Pin fasteners: an inexpensive and effective method of
assembly when loading is primarily in shear
• Semipermanent pin fasteners
– Machine pins
– Radial locking pins
– Quick-release pins
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•
Push-pull pins
Positive locking pins: cotter pins, single acting pins,
double acting pins
Retaining rings or snap rings are used to provide a
removable shoulder to accurately locate, retain or lock
components on shafts and in bores of housings
• Stamped
• Wire-formed
• Spiral-wound
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•
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Springs
Dimension: size, shape, material, diameter,
pitch, shape of ends, length
Controlled action
Variable action
Static
Types of springs
– Compression
– Extension
– Torsion
– Power
MISCELLANEOUS FASTENERS
SPRING NOMENCLATURE
MISCELLANEOUS FASTENERS
TYPES OF SPRINGS
Rivets
Basically a rivet is a ductile metal pin that is inserted through holes in
two or more parts and having the ends formed over to securely hold
the parts
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•
•
•
Large: structural work of buildings and bridges
Aerospace equipment
Small
Blind: blind riveting is a technique for setting a rivet without
access to the reverse side of the joint
MISCELLANEOUS FASTENERS
LARGE RIVETS
MISCELLANEOUS FASTENERS
RIVETED
JOINTS
MISCELLANEOUS FASTENERS
RIVETED
JOINTS
MISCELLANEOUS FASTENERS
CONVENTIONAL RIVET SYMBOLS
11.6 Welded Fasteners and 11.7
Adhesive Fasteners
• A resistance-welded fastener is an externally
or internally threaded metal part designee to
be fused permanently in place by standard
welding equipment
• Stress on bonded joints
– Tensile
– Shear
– Cleavage
– peel
Stresses in bonded joints